La datation classique de la formation de Cloverly, par datation par les traces de fission, donne un intervalle de temps à cheval sur les deux derniers étages du Crétacé inférieur, l'Aptien et l'Albien. Elle est datée entre 115 ± 10 et 108,5 ± 0,2 Ma (millions d'années)[2],[3].
↑ a et b(en) Oreska, Matthew & Carrano, Matthew & Dzikiewicz, Katherine. (2013). Vertebrate Paleontology of the Cloverly Formation (Lower Cretaceous), I: Faunal Composition, Biogeographic Relationships, and Sampling. Journal of Vertebrate Paleontology. 33. 264-292. 10.1080/039.033.0203
↑(en) Chen, Z.-Q. and Lubin, S. 1997. A fission track study of the terrigenous sedimentary sequences of the Morrison and Cloverly Formations in northeastern Bighorn Basin, Wyoming. The Mountain Geologist 34: 51-62
↑(en) Burton, D., Greenhalgh, B.W., Britt, B.B., Kowallis, B.J., Elliott, W.S., and Barrick, R. 2006. New radiometric ages from the Cedar Mountain Formation, Utah and the Cloverly Formation, Wyoming: implications for contained dinosaur faunas. Geological Society of America Abstracts with Programs 38(7): 52
↑(en) Michael D. D'Emic, Brady Z. Foreman, Nathan A. Jud, Brooks B. Britt, Mark Schmitz, and James L. Crowley "Chronostratigraphic Revision of the Cloverly Formation (Lower Cretaceous, Western Interior, USA)," Bulletin of the Peabody Museum of Natural History 60(1), 3-40, (1 April 2019). https://doi.org/10.3374/014.060.0101